Diplomacy (Civ6)

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Diplomacy is the art of making relations with other civilizations in Civilization VI. Having been overhauled from past games, Diplomacy is a mechanic that evolves as eras pass, starting with periods of near constant warfare in ancient times, to more civil interactions in the mid-to-late game.

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Upon first meeting a rival civilization, it may be possible to exchange knowledge of others capitals. When the player's borders are discovered by another civilization, the player is given the option of revealing a nearby city. If the player discovers another civilization's borders, the other civilization may offer to show their nearby city. If two players' units discover each other, they may agree to reveal both civilizations' capitals.

Allies: When in an Alliance with a leader, you may not declare war on each other, you automatically share Open Borders, you may make Research Agreements and Defensive Pacts, and deals you make with each other are likely to be very favorable.

Declared Friend: When you choose to declare your friendship with a leader, you may not declare war on each other, you may make Research Agreements and Defensive Pacts, and deals you make with each other will be more favorable. This relationship state is required to make an Alliance.

Friendly: This means the leader thinks positively of you, and you have a better chance of getting favorable deals with them.

Neutral: You have done nothing to upset or impress the leader, and your interactions with them will be standard.

Unfriendly: For some reason, you have done something to upset this leader, and deals with them will likely by unfavorable for you, or you can choose to make demands of them.

Denounced: This leader has let the other leaders in the world know that you have done something to offend them. Your deals with them will be unfavorable if they will make them at all, but you can declare a Formal War against them and make demands.

At War: Open hostilities have broken out between you two, and you can attack or invade this leader, but you will accrue warmongering and war weariness penalties.

All AI controlled rivals are governed by an Agenda, which affect how they view other civilizations. Each Leader has a set agenda based on their historical traits, which affects their opinions and playstyles.

Each also has a hidden agenda, which is randomly assigned, to further modify their behavior. Unlike the Leader Agenda, hidden agendas must be uncovered through gossip or espionage.

Unlike in Civilization V, attitudes towards warmongering change through the eras. In the Ancient Era, the warmongering penalty is non-existent, and does not become significant until the Renaissance Era. In general, a surprise war will garner more animosity from rivals than a justified war.

A "surprise war" is any declaration of war without any attached casus belli. Until the mid-game, this is the only form of warfare and will not incur as many diplomatic penalties. In later eras, declaring war without a casus belli will be frowned upon and will result in progressively higher penalties.